Chapter 4 · MCQ Read Mode

Chemical Reaction Engineering

The design equation for an ideal CSTR is

For a reaction of positive order, the volume of a PFR compared with that of a CSTR achieving the same conversion is

A CSTR is preferred over a PFR at low conversion for

Space time is defined as

Space time equals the mean residence time only when

For a gas-phase reaction A gives 2B carried out at constant temperature and pressure with pure A fed, the value of epsilon is

For N equal-sized CSTRs in series carrying out a first-order reaction, the exit concentration ratio is

As the number of equal CSTRs in series is increased at a fixed total volume, the conversion

In a series of reactors, the conversion used in the design equation for the second reactor is measured

The rate of reaction for a fluid-solid catalytic reaction is most commonly expressed per unit

A plug flow reactor is conceptually equivalent to

A fluidized bed reactor is preferred over a fixed bed reactor mainly when

For a batch reactor operating at constant volume, the design equation reduces to

The order of a reaction

For which reaction order is the half-life independent of the initial concentration?

A plot of 1/Cₐ against time gives a straight line. The reaction is

The rate constant of a reaction has units of s^-1. The reaction is

In the Arrhenius equation, a plot of ln k against 1/T gives a straight line whose slope equals

A reaction with a high activation energy is

For a gas-phase reaction with epsilon greater than zero carried out at constant temperature and pressure, the concentration of reactant A

For a first-order liquid-phase reaction in a CSTR, the conversion is given by

If the space time of a first-order PFR is doubled, the conversion

The correct order of steps in the isothermal reactor design algorithm is

Pressure drop in a reactor is an important design consideration for

Increasing the catalyst particle size in a packed bed reactor will

A catalyst increases the rate of a reaction by

In the integral method of analysing rate data, one

The differential method of rate-data analysis determines the reaction order from

The main disadvantage of the differential method compared with the integral method is that it

When reactant B is present in very large excess, the observed kinetics are described as

In a differential reactor, the conversion across the catalyst bed is deliberately kept

Which laboratory reactor allows the reaction rate to be obtained directly at steady state without any integration?

Selectivity in a multiple-reaction system is defined as

For the parallel reactions A to D (desired, second order in A) and A to U (undesired, first order in A), the desired product is favoured by

A semi-batch reactor in which one reactant is added slowly to the other is particularly useful for

If the desired reaction has a higher activation energy than the undesired reaction, selectivity is improved by operating at

For the series reaction A to B to C with first-order steps, the concentration of B

For maximising the yield of the intermediate B in the series reaction A to B to C

When several reactions occur simultaneously, the mole balances are most conveniently written in terms of

The pseudo-steady-state hypothesis assumes that

In the Michaelis-Menten equation, the constant Kₘ represents

At substrate concentrations far above Kₘ, an enzyme-catalysed reaction is

A Lineweaver-Burk plot is a plot of

Competitive inhibition of an enzyme is characterised by

In a chemostat operating at steady state, the specific growth rate of the cells equals

Washout occurs in a chemostat when

For an adiabatic reactor, the relation between temperature and conversion is

For an exothermic reversible reaction, the equilibrium conversion

Interstage cooling between catalyst beds in an exothermic reversible reaction is used to

When the heat generation curve and heat removal line for a CSTR intersect at three points, the middle steady state is

Parametric sensitivity in an exothermic packed-bed reactor means that temperature

The step in a chain reaction in which a radical reacts to give a product molecule and another radical is called

The correct sequence of steps in a heterogeneous catalytic reaction begins with

Chemisorption differs from physisorption in that it

The BET method is used to determine

In a Langmuir-Hinshelwood mechanism

If a reaction product appears in the denominator of a heterogeneous catalytic rate law, it indicates that the product

Which observation indicates that a catalytic reaction is controlled by external mass transfer?

For a catalyst pellet with a very large Thiele modulus, the effectiveness factor is approximately

When a reaction is strongly limited by internal pore diffusion, the apparent activation energy is approximately

Loss of catalyst activity by the growth of metal crystallites at high temperature is called

In a pulse tracer experiment, the normalised concentration response directly gives

The variance of the residence time distribution for an ideal plug flow reactor is

In the tanks-in-series model, the number of equivalent tanks is calculated as

The residence time distribution alone is sufficient to predict conversion for

Which of the following is a prokaryotic organism?

Sucrose on hydrolysis yields

Starch and cellulose are both polymers of glucose but differ in

The structural component of all cell membranes, being amphipathic, is

Amino acids are joined together in a protein by

The secondary structure of a protein, such as the alpha helix, is stabilised mainly by

Which base is present in RNA but not in DNA?

In DNA, guanine pairs with cytosine through

The net ATP yield from the complete aerobic oxidation of one molecule of glucose is approximately

The theoretical yield of ethanol from glucose by fermentation is about

The Pasteur effect refers to

The lac operon of E. coli is an example of

Immobilisation of an enzyme on a solid support typically results in